Pontoon boat exterior hull



FIG. 1 is a bottom plan view of a pontoon boat exterior hull showing my new design;

FIG. 2 is a right side elevational view thereof, the left side view being a mirror image of that shown;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof; and

FIG. 5 is a bottom perspective view thereof. 

The ornamental design for a pontoon boat exterior hull, as shown and described. 